A load calc, or a Manual J, or T, or N, depending on the situation, is what
is needed.
Measurements of each room, door, window and wall is taken. Insulation
values, and window types are noted.
The calculation is computed, and it tells the contractor what total BTU
rating is needed for heat, and cooling. The calculation will also tell them
how many BTUs are needed for each room, and thus, then the duct calculation
can be completed.

Crude language?
Maybe if you find that offensive you don't want the guy in your house but if
the F word makes my repairman happy and he does good work he can say it all
day long. I'll even say it with him.
my 2 cents
cj

Don't start by looking at the unit. Start by looking at the contractor.
A good contractor will not sell you junk equipment.
The best equipment not installed properly will never work properly.
Get and check references from any contractor. Make sure they do a
formal load calculation and check not only for the total cooling required,
but also the ductwork required. Make sure they have workman's comp paid
current.
Let them pick the brand of equipment that they know is good and familiar
working with.

Stormin who gives a shit if a tech is "Polite or uses crude language"
cons HAVE to be polite or nobody would listen. The last guy that
conned me was nice as could be and preached and preached, and preached.
With every tough question he preached till I got smart and threw his
lian ass out.
Refrences, thats all you need , lots of refrences. And a few bids.
If King could get CB he would be lucky cause CB will get it done right
the first time.

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